Maximum Trainer

Free, open-source interval trainer with ERG mode, the 2014 desktop app revived for Windows, macOS, Linux and the browser

Innovation: live muscle-oxygen (SmO₂) readings from a Moxy sensor shown during workouts and saved in the ride's FIT file

IndieSource available

Visit maximumtrainer.github.ioSaved in this browser only
The Maximum Trainer workout player before a threshold workout: the Retro Race game asking whether to race your last performance or a pacer, live power, cadence and heart rate, gear 6 of 30, the workout's target graph and the current interval's power trace.
Maximum Trainer · maximumtrainer.github.io
The Maximum Trainer workout library: tests and plan workouts listed with their creator, type, duration, average and normalized power, IF, TSS and a small graph of each workout's intervals.
Maximum Trainer · maximumtrainer.github.io
The Maximum Trainer workout editor: steps with a duration, a power target in % FTP and watts, a cadence target and an on-screen message, above the workout's profile.
Maximum Trainer · maximumtrainer.github.io
Studio mode in Maximum Trainer: six riders, each with their own name, FTP, threshold heart rate, trainer, power, cadence and heart-rate sensors, and ERG control.
Maximum Trainer · maximumtrainer.github.io
Retro Race in Maximum Trainer: a pseudo-3D rider on a retro road during a warm-up, with power, cadence, heart rate, the time left in the interval, the next target of 238 W and a lead of 4 m over the pacer.
Maximum Trainer · maximumtrainer.github.io

5 screenshots. Scroll or swipe sideways.

About

Maximum Trainer was a free indoor training app by Maxime Blais, released in 2014 and shut down in September 2019. Maximum Trainer Redux revives it as open-source software under the GPL-3.0, rebuilt in C++17 and Qt 6, with releases for Windows, macOS (Apple Silicon) and Linux and a beta that runs in Chrome or Edge through Web Bluetooth. It connects over Bluetooth to FTMS smart trainers, power meters, speed and cadence sensors, heart-rate straps and Moxy muscle-oxygen sensors, and shows left/right power balance from dual-sided power meters. Workouts are built in an editor with power, cadence and heart-rate targets, imported from .erg, .mrc and .zwo files, synced from the intervals.icu calendar or picked from included training plans and FTP tests, then ridden in ERG mode, or in slope mode with on-screen virtual gears for single-cog trainers, which a Zwift Click v2 can shift (beta). During a workout the player can show local video, a web page or Retro Race, a pseudo-3D game against your last ride of the workout or a pacer. Studio mode lets several riders train on one computer, each with their own sensors and FTP. Rides are saved as FIT files and upload to Strava and intervals.icu. FTMS rowing machines are supported in beta. Works offline; the browser version has no video, radio or intervals.icu sync.

Features

  • ERG mode
  • Workouts
  • Virtual shifting

Sends rides to

  • Strava
  • intervals.icu
  • Any tracker, by file (FIT, TCX…)

Other sports

  • Rowing

In these lists

Changelog

  1. Version 0.0.247GitHub release

    • Group workouts: ride the same structured workout with friends over the internet
    • Each trainer runs the workout at its own rider's FTP, so targets differ per person
    • Up to 20 riders per room on desktop, not in Studio Mode or Free Ride yet

  2. Version 0.0.245GitHub release

    • Build pipeline now tries the first reachable Ubuntu package mirror, with kernel.org first

  3. Version 0.0.242GitHub release

    • Intervals.icu connection now allowed from the app's new web address
9 older updates

  1. Version 0.0.241GitHub release

    • Fixed reading of cadence and power from FTMS Bluetooth trainer data

  2. Version 0.0.240GitHub release

    • Fixed intervals.icu login by passing the PKCE code verifier through the proxy

  3. Version 0.0.239GitHub release

    • Retries GPU graphics setup after an app update to avoid startup failures

  4. Version 0.0.238GitHub release

    • Windows build now bundles the Visual C++ runtime

  5. Version 0.0.237GitHub release

    • More detailed crash reports for Windows startup crashes

  6. Version 0.0.236GitHub release

    • Recovers from a Windows startup crash in the embedded web engine

  7. Version 0.0.235GitHub release

    • Windows startup smoke test step matching fixed (build side)
    • Dependabot now keeps GitHub Actions up to date (build side)

  8. Version 0.0.234GitHub release

    • Documentation now covers the log file location and fallback on every OS

  9. Version 0.0.232GitHub release

    • Build now treats compiler warnings as errors to catch problems earlier

Summarized by AI from the published release notes; the link has the full notes. Checked 14 Nov 2026.

Sources

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